.\" Generated from pam_chauthtok.c by gendoc.pl
.Dd May 31, 2025
.Dt PAM_CHAUTHTOK 3
.Os
.Sh NAME
.Nm pam_chauthtok
.Nd perform password related functions within the PAM framework
.Sh SYNOPSIS
.In sys/types.h
.In security/pam_appl.h
.Ft "int"
.Fn pam_chauthtok "pam_handle_t *pamh" "int flags"
.Sh DESCRIPTION
The
.Fn pam_chauthtok
function attempts to change the authentication token
for the user associated with the pam context specified by the
.Fa pamh
argument.
.Pp
The
.Fa flags
argument is the binary or of zero or more of the following
values:
.Bl -tag -width 18n
.It Dv PAM_SILENT
Do not emit any messages.
.It Dv PAM_CHANGE_EXPIRED_AUTHTOK
Change only those authentication tokens that have expired.
.El
.Pp
If any other bits are set,
.Fn pam_chauthtok
will return
.Dv PAM_BAD_CONSTANT .
.Sh RETURN VALUES
The
.Fn pam_chauthtok
function returns one of the following values:
.Bl -tag -width 18n
.It Bq Er PAM_SUCCESS
Success.
.It Bq Er PAM_ABORT
General failure.
.It Bq Er PAM_AUTHTOK_DISABLE_AGING
Authentication token aging disabled.
.It Bq Er PAM_AUTHTOK_ERR
Authentication token failure.
.It Bq Er PAM_AUTHTOK_LOCK_BUSY
Authentication token lock busy.
.It Bq Er PAM_AUTHTOK_RECOVERY_ERR
Failed to recover old authentication token.
.It Bq Er PAM_BAD_CONSTANT
Bad constant.
.It Bq Er PAM_BUF_ERR
Memory buffer error.
.It Bq Er PAM_CONV_ERR
Conversation failure.
.It Bq Er PAM_PERM_DENIED
Permission denied.
.It Bq Er PAM_SERVICE_ERR
Error in service module.
.It Bq Er PAM_SYSTEM_ERR
System error.
.It Bq Er PAM_TRY_AGAIN
Try again.
.El
.Sh SEE ALSO
.Xr pam 3 ,
.Xr pam_strerror 3
.Sh STANDARDS
.Rs
.%T "X/Open Single Sign-On Service (XSSO) - Pluggable Authentication Modules"
.%D "June 1997"
.Re
.Sh AUTHORS
The
.Fn pam_chauthtok
function and this manual page were
developed for the
.Fx
Project by ThinkSec AS and Network Associates Laboratories, the
Security Research Division of Network Associates, Inc.\& under
DARPA/SPAWAR contract N66001-01-C-8035
.Pq Dq CBOSS ,
as part of the DARPA CHATS research program.
.Pp
The OpenPAM library is maintained by
.An Dag-Erling Sm\(/orgrav Aq Mt des@des.dev .
